Furnace-door frame.



Patented Jan. 26. 1909.

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L. L. KNOX. FURNACE DOOR FRAME.

APPLIUATION FILED AUG. 6, 1907.

Patented Jan. 26, 1909.

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WITN ESSES Wm 0 L. L. KNOX. FURNACE DOOR FRAME. APPLICATION FILED AUG. 6, 1907.

Patented Jan. 26, 1909.

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- WITNESSES UTED s'rarns rnnr Prion.

' LUTHER L. KNOX, OF PITTSBURG, PENNSYLVANIA.

FURNACE-DOOR FRANCE.

Specification of Letters Patent.

Patented Jan. 26, 1909.

Application filed August 6, 1907. Serial No. 387,311.

hearth furnace; Fig. 2 is a front elevation of i the door frame, partly broken away; Fig; 3 is a view similar to Fig. 2, but showing a modified construction;' and Fig. t is auvertical cross-section through the upper portion of the detachable rim.

vMy invention has relation to furnace door frames, and is designed to provide a rim which is so constructed that the portions thereof which are subjected to destructive heat may be readily removed and renewed I when burned out, the parts necessary to be renewed in such cases, constituting but-a relatively small part of the-frame as a whole, so that the renewal may be affected at a comparatively slight cost, and without dismantling the furnace.

A further object is to providemeans for obtaining an improved water circulation through the adjustable and renewable portions of the frame, and also to provide means for protecting the brick-work door arch of the furnace.

The precise nature of my invention will'be best understood by reference to the accompanying drawings which will now be described, it being premised, however, that various changes may be made therein by those skilled in the art without departing from the spirit and scope of my invention.

In the drawings, the numeral 2 designates the brick-work of an open-hearth furnace, 3 the door opening of the furnace, and 4 a part of the hearth or bottom thereof.

5 designates a main door frame member which is secured to the structural building of the furnace, and which is formed with the cheeks or flanges 6 which form guiding surfaces for a vertically-sliding door and with an inwardly extending flange or. shelf 5 which assists in supporting the top wall of the" door arch. This door may be of any suitable character, but I have. shown it as of the form described and claimed in my ,formed by the wall 18.

Patent No. 864,763, dated August 27th, 1907, in which it is composed of a hollow body portion 7, a refractory backing 8, and

a hollow surroundin rim portion 9 which is detachably secure( to the body, suitable connections 10 being provided for circulating a cooling fluid through the body and The main frame member 5 is formed with a door opening 11 which is somewhat larger than the opening 3 of the furnace in order to receivetherein, a supplemental frame member- 12. is a rim-like structure having an arched top portion and depending "legs, and is constructed to fit within the marginal portion of the opening 11- against the brick-work 2 of the furnace front, with its outer surface substantially flush with the surfaces 13 of the main frame member 5 upon which the door slides. The supplemental frame member is detachably secured within the opening 11 in .any suitablemanner. Inthe drawings, I have shown itas provided with the laterally-extending lugs 14 which enter recesses 15 in the main frame member 5, and which are secured by keys or pins 16. "The up er portion of the supplemental frame mem er has aninward extension 17 which forms a lining for the brick-work arch of the furnace over the opening 11 throughout its entire thickness.

An important object of my invention is to provide for the circulation of water or other cooling medium throughout the entire extent of the supplemental frame member; and for this purpose the latter is cast hollow with an intermediate partition wall 18 which is continuous except at the lower portions of the legs where circulating openings 19 are provid ed. h

20 desi nates a su ly pipe for t e water or other (tooling fluid which is detachably connected tothe central portion of the supplemental frame member, and which opens into the inner of the two compartments 21 is an outlet pipe This supplemental frame memberwhich communicates with the outer of the frame member 5, so that the doorwill slide freely over them. I

The circulation of water is clearly indicated by the arrows in Fig. 2. The waterdelivered by the pipe 20 flows in both directions in the inner compartment, thence out into the two legs of the supplemental frame, around the lower ends of the partition wall, and thence upwardly from both sides to the outlet pi e 21. The partition wall 18 is also extende into the extension 17 which it divides into inner and outer compartments. The upper wall of each of thesecompartments is preferably slightly inclined upwardly toward the front of the furnace, as indicated in Fig. 1, so that the water therein as it becomes heated will tend to rise and be repgaced by cooler water.

, y the construction described, I am enabled to provide for a continuous circulation throughout all portions of the supplemental frame without the necessity for connecting the legs thereof at the bottom. Such a connection is objectionable inasmuch as it necessarily forms a part of the floor of the door opening, and is subject to rapid wear and breakage in charging and discharging the the inner compartment.

furnace. By arrangm the circulating assages in the frame mem er, as shown and described, I am enabled to do away with the use of this connection, and can extend the floor plate or sill 23 of the furnace in the manner shown in Fig. 1, so as to receive the wear in charging and discharging the furnace. The construction also insures a complete circulation through the upper central portion of the supplemental frame member at the oint where the heat is greatest.

In t e modification shown in Fi 3, the upper compartment of the supp emental frame mem er 12 is divided at the top by a transverse vertical partition24. The supply pipe 20 communicates with this outer compartment at one side of the partition 24, while the outlet pipe 21 communicates with said compartment u on the opposite side of the artition 24. this form, the water circu ation, as shown b the arrows is from the pipe 20* downwardfy into one leg of the frame in the outer compartment thereof, thence around the lower end of the partition wall 18*, thence upwardly and around through the entire length of the inner-compartment, thence around the outer end of the partition 18*,and upwardly in the outer compartment to the outlet pipe 21*. The partltion 18 is referably provided with a plurality of smal perforations 25 adjacent to the partition 24, for the purpose of permitting the escape of steam bubbles from This construction provides for a circulation which has all the advantages of the construction shown in Figs. 1 and 2, except that the cooling water becomes heated sometime before reaching that portion of the frame which is exposed to the greatest heat.

A further advantage which results from the use of the separable supplemental frame member is that all portions thereof are subjected to approximately the same heat. This to a large extent overcomes the cracking and breaking which frequently occurs in the ordinary door frames, due to the fact that the portions immediately surrounding the door openings are subjected to much greater heat than those portions which are more distant from the door opening. This unequal heating causes unequal expansion.

What I claim is 1. A furnace door frame, consisting of a main frame member fixedly secured to the furnace and having an opening therethrough larger than the opening of the door, and a detachable supplemental frame, consisting of a rim-like structure fitting within the said opening and forming the to and sides but not the bottom thereof, and aving a continuous water-circulating passage therein, said main and supplemental framemembers having door-seating surfaces in substantial vertical alinement, substantially as described.

2. A furnace door frame consisting of a main metallic frame member secured to the brick wall of the furnace and having a door opening therein, and a supplemental frame member of rim form removably fitted within the saidopening, and forming the top and sides, but not the bottom thereof, said supplemental frame member having inner and outer circulating compartments, the inner compartment being continuous throughout the member; substantially as described.

3. As a new article of manufacture, a rim structure for furnace door frames consistin of an arch with depending legs disconnected at their lower ends, and having therein inner and outer compartments, the inner compartment being continuous through the arch and above the legs; substantially as described.

4. In a furnace door frame, a main frame member having a door or opening therein,

and a supplemental frame member consistin 3.

of a rim structure arranged to fit within sai opening, and having inner and outer water circulating compartments, the inner compartment at least being continuous around the entire rim structure, together with circulating connections for sai compartments; substantially as described.

5. In a furnace door frame, a main frame member, and a sup lemental frame member consisting of a rim-like structure arranged to fit removably within the door opening of the main frame, and havin an inward extension at its upper portion which extends into the furnace wall and forms a lining for the arch of the door opening thereof, together with means for circulating a cooling fluid through said sup lemental frame; substantially as described 6. In a furnace door frame, a main frame member, and a supplemental frame member fit removably Within the door opening of the stantially as described.

consisting of'e rim-like structure arranged to through the inward extension thereof; sub- '10 main frame, and havin an inward extension In testimony' whereof I have hereunto set at its upper portion w 'ch projects into the my hand.

i Wall of the furnace and forms a. lining for the LUTHER L. KNOX. arch-0f the door opening thereof, together Witnesses:

with means for circulating a, cooling fluid GEO. H. PARMELEE, through said supplemental frame; and also H. M. CORWIN. 

